diff options
Diffstat (limited to 'bfd/cpu-i386.c')
| -rw-r--r-- | bfd/cpu-i386.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/bfd/cpu-i386.c b/bfd/cpu-i386.c index f98c0e5052..f8991cf1ec 100644 --- a/bfd/cpu-i386.c +++ b/bfd/cpu-i386.c @@ -23,6 +23,9 @@ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" +#include "libiberty.h" + +extern void * bfd_arch_i386_fill (bfd_size_type, bfd_boolean, bfd_boolean); static const bfd_arch_info_type * bfd_i386_compatible (const bfd_arch_info_type *a, @@ -38,6 +41,62 @@ bfd_i386_compatible (const bfd_arch_info_type *a, return compat; } +/* Fill the buffer with zero or nop instruction if CODE is TRUE. */ + +void * +bfd_arch_i386_fill (bfd_size_type count, + bfd_boolean is_bigendian ATTRIBUTE_UNUSED, + bfd_boolean code) +{ + /* nop */ + static const char nop_1[] = { 0x90 }; + /* nopw */ + static const char nop_2[] = { 0x66, 0x90 }; + /* nopl (%[re]ax) */ + static const char nop_3[] = { 0x0f, 0x1f, 0x00 }; + /* nopl 0(%[re]ax) */ + static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 }; + /* nopl 0(%[re]ax,%[re]ax,1) */ + static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; + /* nopw 0(%[re]ax,%[re]ax,1) */ + static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 }; + /* nopl 0L(%[re]ax) */ + static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 }; + /* nopl 0L(%[re]ax,%[re]ax,1) */ + static const char nop_8[] = + { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}; + /* nopw 0L(%[re]ax,%[re]ax,1) */ + static const char nop_9[] = + { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; + /* nopw %cs:0L(%[re]ax,%[re]ax,1) */ + static const char nop_10[] = + { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; + static const char *const nops[] = + { nop_1, nop_2, nop_3, nop_4, nop_5, + nop_6, nop_7, nop_8, nop_9, nop_10 }; + + void *fill = bfd_malloc (count); + if (fill == NULL) + return fill; + + if (code) + { + bfd_byte *p = fill; + while (count >= ARRAY_SIZE (nops)) + { + memcpy (p, nops[ARRAY_SIZE (nops) - 1], ARRAY_SIZE (nops)); + p += ARRAY_SIZE (nops); + count -= ARRAY_SIZE (nops); + } + if (count != 0) + memcpy (p, nops[count - 1], count); + } + else + memset (fill, 0, count); + + return fill; +} + static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax = { 64, /* 64 bits in a word */ @@ -51,6 +110,7 @@ static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax = FALSE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, 0 }; @@ -67,6 +127,7 @@ static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax = FALSE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &bfd_x64_32_arch_intel_syntax, }; @@ -83,6 +144,7 @@ static const bfd_arch_info_type bfd_i386_arch_intel_syntax = TRUE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &bfd_x86_64_arch_intel_syntax }; @@ -99,6 +161,7 @@ static const bfd_arch_info_type i8086_arch = FALSE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &bfd_i386_arch_intel_syntax }; @@ -115,6 +178,7 @@ static const bfd_arch_info_type bfd_x64_32_arch = FALSE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &i8086_arch }; @@ -131,6 +195,7 @@ static const bfd_arch_info_type bfd_x86_64_arch = FALSE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &bfd_x64_32_arch }; @@ -147,5 +212,6 @@ const bfd_arch_info_type bfd_i386_arch = TRUE, bfd_i386_compatible, bfd_default_scan, + bfd_arch_i386_fill, &bfd_x86_64_arch }; |